Issue running mc2 client

I am constantly getting this issue: how to resolve this?
File "/mc2/client/mc2.py", line 192, in
mc2.configure_job(config)
File "/usr/local/lib/python3.6/dist-packages/mc2client-0.0.1-py3.6.egg/mc2client/core.py", line 1215, in configure_job
_attest(head_address, simulation_mode, enclave_signer_pem)
File "/usr/local/lib/python3.6/dist-packages/mc2client-0.0.1-py3.6.egg/mc2client/core.py", line 1271, in _attest
response = stub.GetRemoteEvidence(attest_pb2.AttestationStatus(status=0))
File "/usr/local/lib/python3.6/dist-packages/grpc/_channel.py", line 946, in call
return _end_unary_response_blocking(state, call, False, None)
File "/usr/local/lib/python3.6/dist-packages/grpc/_channel.py", line 849, in _end_unary_response_blocking
raise _InactiveRpcError(state)
grpc._channel._InactiveRpcError: <_InactiveRpcError of RPC that terminated with:
status = StatusCode.UNAVAILABLE
details = "failed to connect to all addresses"
debug_error_string = "{"created":"@1732308449.684310175","description":"Failed to pick subchannel","file":"src/core/ext/filters/client_channel/client_channel.cc","file_line":3008,"referenced_errors":[{"created":"@1732308449.684306938","description":"failed to connect to all addresses","file":"src/core/ext/filters/client_channel/lb_policy/pick_first/pick_first.cc","file_line

Start at /mc2/client/mc2.py line 192, then trace configure_job in mc2client/core.py around lines 1215 and 1271, where _attest calls GetRemoteEvidence. Investigate the gRPC UNAVAILABLE error and failed connection addresses; done means documenting the cause and a reproducible resolution for this client setup.